CK isn't what we've made him out to be

Black House quote on the two Kings:
“You asked how many worlds,” Parkus begins. “The answer, in the High Speech, is da fan: worlds beyond telling.” With one of the blackened sticks he draws a figure eight on its side, which Jack recognizes as the Greek symbol for infinity.

“There is a Tower that binds them in place. Think of it as an axle upon which many wheels spin, if you like. And there is an entity that would bring this Tower down. Ram Abbalah.”

At these words, the flames of the fire seem to momentarily darken and turn red. Jack wishes he could believe that this is only a trick of his overstrained mind, but cannot. “The Crimson King,” he says.

“Yes. His physical being is pent in a cell at the top of the Tower, but he has another manifestation, every bit as real, and this lives in Can-tah Abbalah—the Court of the Crimson King.”

“Two places at once.” Given his journeying between the world of America and the world of the Territories, Jack has little trouble swallowing this concept.

“Yes.”

“If he—or it—destroys the Tower, won’t that defeat his purpose? Won’t he destroy his physical being in the process?”

“Just the opposite: he’ll set it free to wander what will then be chaos . . . din-tah . . . the furnace. Some parts of Mid-World have fallen into that furnace already.”

References to the King's goal:
“The Crimson King’s Breakers are only hurrying along a process that’s already in train. The machines are going mad. You’ve seen this for yourself. The men believed there would always be more men like them to make more machines. None of them foresaw what’s happened. This … this universal exhaustion.”
“The world has moved on.”
“Aye, lady. It has. And left no one to replace the machines which hold up the last magic in creation, for the Prim has receded long since. The magic is gone and the machines are failing. Soon enough the Dark Tower will fall. Perhaps there’ll be time for one splendid moment of universal rational thought before the darkness rules forever. Wouldn’t that be nice?”
“Won’t the Crimson King be destroyed, too, when the Tower falls? Him and all his crew? The guys with the bleeding holes in their foreheads?”
“He has been promised his own kingdom, where he’ll rule forever, tasting his own special pleasures.” Distaste had crept into Mia’s voice. Fear, too, perhaps.
“Promised? Promised by whom? Who is more powerful than he?”
“Lady, I know not. Perhaps this is only what he has promised himself.” Mia shrugged. Her eyes wouldn’t quite meet Susannah’s.

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Maerlyn states that the King at the top of the Tower can't destroy the Guardians of the Beam:

“And who is Daria?”
“A prisoner, like you. Locked in a little machine the people of the Fagonard gave me. I think she’s dead.”
“Sorry for your loss, son.”
“She was my friend,” Tim said simply.
Maerlyn nodded. “It’s a sad world, Tim Ross. As for me, since this is the Beam of the Lion, ’twas his little joke to put me in the shape of a great cat. Although not in the shape of Aslan, for that’s magic not even he can do . . . although he’d like to, aye. Or slay Aslan and all the other Guardians, so the Beams collapse.”
“The Covenant Man,” Tim whispered.
Maerlyn threw back his head and laughed. His conical cap stayed on, which Tim thought magical in itself. “Nay, nay, not he. Little magic and long life’s all he’s capable of. No, Tim, there’s one far greater than he of the broad cloak. When the Great One points his finger from where he bides, the Broad Cloak scurries. But sending you was none of the Red King’s bidding, and the one you call the Covenant Man will pay for his foolery, I’m sure. He’s too valuable to kill, but to hurt? To punish? Aye, I think so.”

Proof that he was speaking of the King at the top of the Tower:

“How did the Red King catch thee?”
“He can’t catch anyone, Tim—he’s himself caught, pent at the top of the Dark Tower. But he has his powers, and he has his emissaries. The one you met is far from the greatest of them. A man came to my cave. I was fooled into believing he was a wandering peddler, for his magic was strong. Magic lent to him by the King, as you must ken.”